stylechooser2.java

提供了常用的JAVA技术的示例

// 13-4 构 造 swing 不 同 显 示 风 格 。
package StyleChooser2;

import java.awt.*;
import java.awt.color.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.ImageIcon;
import javax.swing.border.*;
import javax.swing.UIManager;

public class StyleChooser2 extends JFrame{
    StyleChooser2 frame;
    static String metal="Metal";
    static String metalClassName="javax.swing.plaf.metal.MetalLookAndFeel";

    static String motif="Motif";
    static String motifClassName="com.sun.java.swing.plaf.motif.MotifLookAndFeel";

    static String windows="windows";
    static String windowsClassName="com.sun.java.swing.plaf.windows.WindowsLookAndFeel";

    JRadioButton motifButton=new JRadioButton(motif),
                 metalButton=new JRadioButton(metal),
                 windowsButton=new JRadioButton(windows);

    JLabel label=new JLabel("the styles of swing has ");

    public StyleChooser2(){
        super("StyleChooser");
        JPanel panel=new JPanel();
        frame=this;
        metalButton.setMnemonic(KeyEvent.VK_E);
        metalButton.setActionCommand(metalClassName);
        motifButton.setMnemonic('M');
        motifButton.setActionCommand(motifClassName);
        windowsButton.setMnemonic('w');
        windowsButton.setActionCommand(windowsClassName);

        // 归 为 一 组
        ButtonGroup group=new ButtonGroup();
        group.add(motifButton);
        group.add(metalButton);
        group.add(windowsButton);


        // 监 听
        RadioListener myListener=new RadioListener();
        motifButton.addActionListener(myListener);
        metalButton.addActionListener(myListener);
        windowsButton.addActionListener(myListener);

        getContentPane().setLayout(new BorderLayout());
        getContentPane().add("North",label);
        getContentPane().add("Center",panel);

        panel.add(motifButton);
        panel.add(metalButton);
        panel.add(windowsButton);
        panel.setLayout(new GridLayout(3,1));

        motifButton.setToolTipText("motif");
        metalButton.setToolTipText("metal");
        windowsButton.setToolTipText("windows");

        pack();
        //frame.setSize(200,150);
        setVisible(true);
        addWindowListener(new WindowAdapter(){
          public void windowClosing(WindowEvent e){
            System.exit(0);
          }
        });
    }

    class RadioListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
            String InfName=e.getActionCommand();
            try{
                UIManager.setLookAndFeel(InfName);
                SwingUtilities.updateComponentTreeUI(frame);
                System.out.println("InfName="+InfName);
                //frame.pack();
                updateState();
            }
            catch(Exception ee){
                JRadioButton button=(JRadioButton)e.getSource();
                button.setEnabled(false);
                updateState();
                System.err.println("error info :"+ee.getMessage());
                System.err.println("could not load lookandfeel:"+InfName);
            }
        }
    }



    public void updateState(){

        String InfName=UIManager.getLookAndFeel().getClass().getName();
        System.out.println("indexOf(motif)="+InfName.indexOf(motif));
        System.out.println("indexOf(metal)="+InfName.indexOf(metal));
        System.out.println("indexOf(windows)="+InfName.indexOf(windows));

        if(InfName.indexOf(metal)>=0){
            metalButton.setSelected(true);
        }else if(InfName.indexOf(windows)>=0){
            windowsButton.setSelected(true);
        }else if(InfName.indexOf(motif)>=0){
            motifButton.setSelected(true);
        }else{
            System.err.println("StyleChooser is using an unknown:"+InfName);
        }
    }

    public static void main(String[] args) {
      StyleChooser2 f = new StyleChooser2();
      f.updateState();
  }
}